You both must be physically present to be married. You cannot get married by telephone, webcam or by proxy.

You both must not be currently married. If you are divorced, you must show proof of your divorce when you apply for a marriage licence.

To get married in Ontario, you do not have to be a Canadian citizen or live in Ontario.
The first step to getting married in Ontario is to get a marriage license. For more information, read How do I get a marriage license in Ontario?

If You Are Already Married

Marriages by proxy that are performed in another country's embassy or consulate in Canada are not valid in Canada, and are not valid sponsorship relationships.

If you got married by proxy outside of Canada in a place that allows proxy marriage, this might be a valid sponsorship relationship.